题目内容
如图所示为一交变电流随时间变化的图象,此交流电的有效值是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102311249602394.png)
A.10
| B.10A | C.7
| D.7A |
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102311249602394.png)
由有效值的定义可得
I12Rt1+I22Rt2=I2RT,
代入数据得(6
)2R×
+(8
)2×R×
=I2R×T,
解得I=10A
故选B
I12Rt1+I22Rt2=I2RT,
代入数据得(6
2 |
T |
2 |
2 |
T |
2 |
解得I=10A
故选B
![](http://thumb2018.1010pic.com/images/loading.gif)
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